US3014980A - Insulation systems - Google Patents

Insulation systems Download PDF

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US3014980A
US3014980A US805953A US80595359A US3014980A US 3014980 A US3014980 A US 3014980A US 805953 A US805953 A US 805953A US 80595359 A US80595359 A US 80595359A US 3014980 A US3014980 A US 3014980A
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Prior art keywords
percent
insulation
tape
weight
organopolysiloxane
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Expired - Lifetime
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US805953A
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Walter L Marshall
John J Keane
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General Electric Co
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General Electric Co
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Application filed by General Electric Co filed Critical General Electric Co
Priority to US805953A priority Critical patent/US3014980A/en
Priority to GB11071/60A priority patent/GB942398A/en
Priority to JP2069560A priority patent/JPS388415B1/ja
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/30—Windings characterised by the insulating material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/40—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes epoxy resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/50—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials fabric

Definitions

  • This invention A relates to new and useful electrical insulating systems. More particularly, it relates to new insulating systems ⁇ for electrical conductors and particularly for electrodynamic machine windings, said insulation system being characterized by improved electrical stress endurance relative to conventional organic resinmica insulation systems. The systems are also characterized by superior corona resistance, excellent thermal characteristics and resiliency which ⁇ decreases the tendency for tape migration and cracking due to different thermal expansions of the insulated conductor bar and the slot material of an electrodynarnic machine.
  • Windings for electrodynamic machines are generally constructed of a plurality of conductor turns or strands or both insulated from each other and having a surrounding or outer ground insulation around the assembled strands.
  • the individual conductors or strands after coating with an insulating material, are placed together in transposed fashion with an insulating separator between each stack of conducto-rs.
  • the voids left in the bar periphery are filled by an insulating material.
  • ground insulation A number of materials and insulation systems have been used ⁇ for the outer insulation of such electrodynamic machine conductors, such insulation commonly being known as ground insulation.
  • ground insulation systems have been various combinations of mica tape impregnated with asphaltic or bitumen material.
  • ground insulation has a rather limited resistance to elevated temperature.
  • organopolysiloxane or silicone materials which in general are characterized not only by good electrical insulating qualities but by resistance to high temperature.
  • a ground insulation system utilizing organopolysiloxane material is described in Patent 2,789,155, April 16, 1957, assigned to the same assignee as this invention.
  • a ground insulation system comprising lirst, a layer composed of glass fiber tape coated and impregnated with organopolysiloxane and superimposed thereon a plurality of layers of organopolysiloxane containing tape comprising a backer material of a cured organopolysiloxane, said backer having thereon a substantially uncured organopolysiloxane composition having essentially nonreinforcing fillers.
  • An outer insulating layer composed of organopolysilo-xane coated and impregnated glass tape is placed over the insulation.
  • organopolysiloxane insulation system is'characterized by good electrical insulating qualities, when cured it produces a product of rather low physical strength and limited resistance to creep under load. It is also subject to a certain amount of chemical instability when exposed to moisture ⁇ and temperature.
  • a principal object of this invention is to provide an insulating system for electrodynamic machine conductors Alkali which is characterized by good electrical qualities and superior physical qualities.
  • the invention comprises a ground insulation system consisting of a fabric tape coated and impregnated with a vinylpolysiloxane as described more fully hereinafter, superimposed upon which there is a layer of vinylpolysiloxane and a second layer of fabric coated and impregnated with vinylpolysiloxane, the entire insulation being used into a compact unitary mass.
  • the strand insulation or inter-strand insulation of electrodynamic machine conductors used in connection with the present invention may be chosen ⁇ from a wide variety of materials so long as such materials are resistant to the temperatures of about to 200 C. which are necessary to cure the ground insulation and more particularly the organopolysiloxane content of the ground insulation.
  • a typical inter-strand insulation has as its resinous component epoxy resin compositions of particular characteristics.
  • the epoxy resins in general are well known in the art. They are described in Castan U.S. Patent Nos. 2,324,483 and 2,444,333, British Patent No. 518,057 and British Patent No. 579,698.
  • the ethoxyline resins described therein are the reaction product of an epihalogenohydrin such as epichlorohydrin and a phenol having at least two phenolic hydroxy groups such as bis-(ll-hydroxy phenyl)-2,2 propane.
  • an epihalogenohydrin such as epichlorohydrin
  • a phenol having at least two phenolic hydroxy groups such as bis-(ll-hydroxy phenyl)-2,2 propane.
  • U.S. Patent Nos. 2,494,295; 2,500,600 and 2,511,913 describe further ethoxyline resins which can be used in conjunction with the invention. The above patents are incorpated herein by reference.
  • the ethoxyline resins used herein have more than one epoxy group per molecule and can generally be prepared by reacting a polyhydroxy alcohol or phenol such as hydroquinone, resoreinol, glycerine and condensation products of phenols with ketones, for example, bis-(4-hydroxy phenyl)2,2propane with epichlorohydrin.
  • a polyhydroxy alcohol or phenol such as hydroquinone, resoreinol, glycerine and condensation products of phenols with ketones, for example, bis-(4-hydroxy phenyl)2,2propane
  • ketones for example, bis-(4-hydroxy phenyl)2,2propane
  • the reaction of epichlorohydrin with bis- (Il-hydroxy phenyl)-2,2propane is as follows:
  • Epon 828 Liquid Epen 824... 225-290 20-28 Epon 1310. 220-225 77.
  • Araldite 6005 18o-190 Liquid.
  • Araldite 6010 192 Do.
  • the epoxy resin curing agents which have useful in the invention are those described in application Serial No. 691,173, October 1, 1957, now Patent 2,962,410, assigned to the same assignee as this invention included by reference herein.
  • curing agents comprising a mixture of an organic nitrogen-containing base having at least one nitrogen atom per molecule and no more than one hydrogen atom on each nitrogen atom, said base containing no other reactive groups or groups which are reactive with therethoxyline resin or the alkyl titanate, and an organic titanium ester.
  • Exampies of reactive groups clude hydroxyl or carboxyl groups as well as multiple hydrogeneous atoms on nitrogen atoms.
  • nitrogen-containing bases as set rorth in the above application which is included herein by reference are amines such as piperidine, pyridine, dibutylamine, triethanolamine, tributylamine, morpholine, n-cocomorpholine, trimethylarnine, diethylamine, dibutylamine, and derivatives of these amines.
  • the titanates found useful are those of the general formula THOR) 4, wherein R is a radical selected from the group consisting of the saturated and unsaturated aliphatic hydrocarbons, for example, methyl, ethyl, etc., and vinyl alkyl, etc., aralkyl, alkaryl, and ⁇ cycloaiiphatic radicals, among others.
  • boron-triilu(iride-organic base complex materials are well known in the art and are conveniently prepared by adding to an ether solution of base or amine as desired an ether solution of the boron-trifluoride-ether complex. They can also be prepared -by simply bubbling iluorine solution or gas through an ether solution of a base.
  • alkyl others are used, such as methyl, ethyl, propyl, butyl, etc. or mixed alkyl others, as Well as aryl others, esters, alkyl, alkaryl, and arakyl others.
  • amines which can be used are methylamine, ethylamine, propylamine7 butyiamine, aniline, diethyl aniline, toluidene, chloroaniline, nitroaniline, and piperidine.
  • complexes prepared as above of boron trilluoride with materials such as phenol and eiherate complexes.
  • suitable ethers and base materials will occur to those skilled in the art.
  • a BPB-ethylamine complex material is commercially available from the Shell Chemical Company and is known as BF3-400, From about 1.5 to 6 percent by weight or this material, preferably from 2.5 to 3.5 percent, based on the resin weight, is used.
  • the wire is coated with epoxy resin varnish containing a curing agent, asbestos fibers, or other suitable fibrous materials are applied thereto, and these fibers are in turn impregnated with the epoxy resin varnish, any excess of epoxy resin being removed by wipers.
  • preimpregnated tapes can also be used.
  • the material is also heated to expel all volatile material such as solvent, but not to the extent that any curing of the strand insulation takes place.
  • Epen 1310 is the polyglycidyl ether of 1,1', 2,2tetrakis (hydroxyphenyl) ethane.
  • a preferred epoxy resin solution for such use is one containing, by weight, 14 percent Epon 1310, 7.111- percent Araldite 6010, 4.3 percent tetrabutyl titanate, 1.5 percent dimethyl soya amine, and 8.8 percent methyl ethyl ketone. It will be realized, of course, that in place of the methyl ethyl ketone, any of the other well known solvents for epoxy resins may be used, so long as they are compatible.
  • the vertical separators 3 are readily made by impregnating an asbestos glass cloth of the usual type with an epoxy resin solution as by dipping, brushing, or application through coating rollers, the finished material again being completely dried but with no polymerization taking place.
  • Typical epoxy resin solutions for vertical separator treatment are those containing, by weight, from about 35 to 65 percent Epon 1310, l0 to 20 percent Araldite 6010, 0.2 to l0 percent tetrabutyl titanate, 0.1 to 6 percent dimethyl soya amine, and 30 to 60 percent methyl ethyl ketone, while a specifically preferred material is one containing, by Weight, 41.7 percent Epon 1310, 13 percent Araldite 6010, 2.7 percent tertabutyl titanate, 1.1 percent dimethyl soya amine, and 41.5 percent methyl ethyl ketone.
  • Other epoxy and polyester compositions well known to those skilled in the art, can be used.
  • a primer coat is preferably applied to the conductor bar, the resin for which has been cured by baking in excess of 150 C. for about 1 hour more or less.
  • One such primer material contains about 1000 parts of toluene, from 250 to 1000 parts, by weight, of a vinylpolysiloxane such as those described hereinafter, up to about l0 parts of tertiary butyl pcrbenzoate and from about 10 to 50 parts, preferably from about 1 to 25 parts of bis(2,4-dichlorobenzoyl) peroxide.
  • the coating of primer is dried at room temperature on the bar and then cured for one-half hour at about 135 C. lt will be realized that this curing is of a time-temperature relationship and may be varied in manners well known to those skilled in the art.
  • the primer above can be improved by adding about parts by weight of vinyl triethoxy silane to the dispersion, such additional material improving the wetting and bond strength.
  • Another primer which can simply be applied to the bar and allowed to cure for about 24 hours at room temperature comprises, by Weight, about 5 parts of methyl silicone oil, about 1 part of vinyl triethoxysilane, 6 parts toluene and from 0.05 to about 0.15 part of tin octoate.
  • Still a further primer which may advantageously be used is a 10 percent solution of polyvinyl formal in dioxane.
  • the rst layer of the ground insulation proper is a so-called armoring layer which serves to prevent cutting of the overlying unsupported tape layers under impact or damaging due to possibly sharp edges of the strands which may occur particularly when the Roebel transposition has been carried out.
  • This armoring layer 5 consists of an orgauopolysiloxane coated and impregnated glass fabric and can, in addition, if indicated, also include electrical grading material such as carbon, carbonaceous material, conductive compounds, metal, etc.
  • the organopolysiloxanes which have been found particularly useful in connection with our invention are those described in copending application, Serial No. 680,438-Bobear, filed August 26, 1957, and assigned to the same assignee as this invention, and patent application Serial No.
  • the methylvinylpoly siloxane is prepared typically by reacting octamethylcyclotetrasiloxane and tetramethyl tetravinylcyclotetrasiloxane in such proportions that the final polysiloxane gum contains about 0.2 mol percent vinyl groups on the polysiloxane chain with 0.001 percent, by weight KOH at a temperature of about 140 C. to 150 C.
  • Such alkylarylvinylpolysiloxanes can typically be made, for example, by mixing octamethylcyclotetrasiloxane in the amount of 100 parts, by Weight, with 15 parts of octaphenylcyclotetrasiloxane and heating to about 130 C., thereafter adding 0.023 part l,3,5,7-tetramethyl-1,3,5,7- tetravinyl cyclotetrasiloxane to the mixture with about 0.01 percent, by weight, KOH, based on the total weight of the organopolysiloxanes, the mixture then being heated for about 5 hours with stirring at 165 C. to 175 C.
  • the KOH is then neutralized as with trichloroethyl phosphite at 175 C. and devolatilized to produce a methyl phenyl silicone containing an average of about two organic groups to each silicon atom.
  • This material is typically mixed in the amount'of 100 parts, by weight, with about 4 parts of diphenylsilanediol, and about 40 parts of finely divided silica over a period of about 21/2 hours to insure smooth and complete blending of the filler with the polmer mix, this mixing being accomplished in a Banbury mixer, doughmixer or equivalent apparatus at a temperature of about 140 C. to about 180 C.
  • the glass ber fabric which is used as the armor layer is simply coated and impregnated with either of the two above types of organopolysiloxane as desired, or mixtures thereof.
  • the fabric is first primed with the below described vinyltriethoxy silane-glycol reaction product.
  • the tape is butt lapped although, of course, any other type of lapping can be used.
  • a layer 6 comprising a plurality of turns or plies of unsupported organopolysiloxane tape.
  • This tape consists of two components, a so-called hacker which is fully cured in the usual way, and a so-called adhesive layer of organopolysiloxane which is semi-cured in manners well known to those skilled in the art.
  • This layer can be graded electrically, if desired, by the use of conductive or semiconductive material as above. It has been found again that the above described organopolysiloxanes are most useful for this purpose, either one being used as the backer with the other being used as the adhesive.
  • the tape is formed in manners which are well known to those skilled in the art, typically being formed on calender rolls with or without a thin film carrier, as required.
  • the backer is formed first and is cured, after which the adhesive material is applied in a semi-cured condition to the hacker.
  • methylvinylpolysiloxane described above as a fully cured material
  • methyl phenylvinylpolysiloxane material described as an adhesive in the semi-cured condition for a tape 15 mils in thickness there was obtained a tensile strength of 886 lbs. per sq. inch, an elongation of 325 percent, and a tear strength of 99 lbs. per inch.
  • the insulating materials of the invention are particularly resistant to reversion or return to a shapeless mass. For example when the present materials were placed in an oven at 160 C. which was cycled to room temperature over each weekend and then back to 160 C., there was no evidence of reversion even after eight months of such testing.
  • a layer 7 of glass-polyethylene terephthalate tape Over the layer 6 of unsupported silicone tape there is applied a layer 7 of glass-polyethylene terephthalate tape, the glass yarns constituting the fill of the tape and the polyethylene glycol terephthalate the warp thereof.
  • This tape is coated and impregnated with an organopolysiloxane such as either of those described above, the glass fabric being first primed with a primer obtained by interacting at least 2%.
  • a mixture of 0.950 vinyl trialkoxysilane and 0.05 mol of methyltrichlorosilane is added over a period of about 10 minutes to 9 grams of violently agitated isopropyl alcohol in a suitable container.
  • methyltrichlorosilane is added to the resultant acidic reaction mixture.
  • the system is then arranged for vacuum stripping under water aspiration, such stripping being continued until the container temperature reaches 100 C.
  • the resultant homogeneous mixed solution is then neutralized with calcium carbonate mixed with finely divided silica and fullers earth and filtered to produce 192 product grams of final product which is then adjusted with respect to acidity by the addition of acetic acid up to a concentration of 0.5 percent, by weight, based on the Weight of the resin.
  • the primer solution consists typically of a 10 percent water solution the fabric being merely dipped in the solution, air-dried and baked for about 10 minutes in 150 C., followed by a 10 minute bake of 250 C. There is calendered to the primed glass fabric either the methylvinylpolysiloxane gum composotion or the methylphenylvinylpolysiloxane composition as described above.
  • the armored tape is butt or half lapped around the periphery of the smesso Il insulated conductor bar to the thickness desired.
  • the other components of the present ground insulation electrically grading material can be used as desired to obtain well known effects.
  • the entire insulatinfr system is cured by heating at temperatures ranging from about several minutes to about four hours at temperatures ranging from about l25 C. to about 200 C. at pressures of from about l5 psi. to lO psi. it will be realized that the curing cycle is of a time-ternperature-pressure nature, variations any of the parameters requiring corresponding changes in the other curing conditions.
  • a post cure of about one hour at about 150 C. followed by a cure or" from about four to forty-eight hours at 200 C. is also preferred. lt will be realized that this treatment can also be varied.
  • the inner armor layer is typically about l mils '"i'd' the tim/n,
  • unsupported silicone layers about 135 to 155 mils thick and the outer armor layer about 30 mils thick for a total thickness of about 200 mils per side.
  • insulation systems for electrical conductors which are characterized by goed electrical qualities and rugged physical features. Their resiliency obviates the tape or insulation migration present in the usual systems. Their improved thermal capability permits operation at higher temperatures and facilitates the production of machines of higher capacity.
  • hey are characterized by improved heat transfer and resistance to reversion of their components under high ternperatures.
  • An insulating system for electrical conductors comprising successively over said conductor (l) a layer of glass fabric tape primed with the reaction product of vinyl triethoxy silane and ethylene glycol and coated and impregnated with an organopolysiloxane selected from the class consisting of alkyl vinyl polysiloxane and alkyl aryl vinyl polysiloxane, (2) a layer of unsupported organopolysiloxane comprising a hacker selected from the class consisting of filled alkyl vinyl polysiloxane containing an organic carbonate and filled alkyl aryl vinyl polysiloXane and an adhesive layer selected from the group consistingT of filled alkyl vinyl polysiloXane containing an organic carbonate and iilled alkyl aryl vinyl polysiloxane and (3) a layer of fabric tape woven from glass tibers and polyethylene terephthalate fibers, said tape being primed with the reaction product ot vinyl triethoxy
  • a insulating system for an electrical conductor as in claim l said layer (l) containing an electrically semi-conductive material.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US805953A 1959-04-13 1959-04-13 Insulation systems Expired - Lifetime US3014980A (en)

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US805953A US3014980A (en) 1959-04-13 1959-04-13 Insulation systems
GB11071/60A GB942398A (en) 1959-04-13 1960-03-29 Improvements in and relating to insulated conductors
JP2069560A JPS388415B1 (it) 1959-04-13 1960-04-13

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3252117A (en) * 1962-05-21 1966-05-17 Westinghouse Electric Corp Transposed winding and insulation arrangement for electrical apparatus
US3263196A (en) * 1963-07-16 1966-07-26 Mc Graw Edison Co Encapsulated electrical coil having means to aid impregnation
US3930915A (en) * 1973-04-17 1976-01-06 Westinghouse Electric Corporation Method of making an electrical article
US4729166A (en) * 1985-07-22 1988-03-08 Digital Equipment Corporation Method of fabricating electrical connector for surface mounting
US20060195969A1 (en) * 2005-03-02 2006-09-07 Ragan Thomas G Glove construction and method of making same
US9072325B2 (en) 2012-08-30 2015-07-07 Shelby Group International, Inc. Glove finger attachment system
US9510628B2 (en) 2013-03-15 2016-12-06 Shelby Group International, Inc. Glove thermal protection system
US20170033631A1 (en) * 2015-07-29 2017-02-02 Siemens Energy, Inc. Method for roebel transposition of form wound conductors of electrical machines such as generators and motors
EP3185404A1 (de) * 2015-12-22 2017-06-28 Siemens Aktiengesellschaft Elektrische maschine mit einem stator sowie deren verfahren zur herstellung eines derartigen stators
US10694795B2 (en) 2017-01-10 2020-06-30 Shelby Group International, Inc. Glove construction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB599097A (en) * 1945-09-13 1948-03-04 Alan Ashby Drummond Improvements in or relating to electrical insulation
US2789155A (en) * 1955-07-13 1957-04-16 Gen Electric Adhesive silicone rubber sheet material and tapes and method of preparing the same
US2875172A (en) * 1956-11-01 1959-02-24 Gen Electric Process for compounding alkyl aryl vinyl silicone elastomer with filler and silanediol, and product obtained thereby

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB599097A (en) * 1945-09-13 1948-03-04 Alan Ashby Drummond Improvements in or relating to electrical insulation
US2789155A (en) * 1955-07-13 1957-04-16 Gen Electric Adhesive silicone rubber sheet material and tapes and method of preparing the same
US2875172A (en) * 1956-11-01 1959-02-24 Gen Electric Process for compounding alkyl aryl vinyl silicone elastomer with filler and silanediol, and product obtained thereby

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3252117A (en) * 1962-05-21 1966-05-17 Westinghouse Electric Corp Transposed winding and insulation arrangement for electrical apparatus
US3263196A (en) * 1963-07-16 1966-07-26 Mc Graw Edison Co Encapsulated electrical coil having means to aid impregnation
US3930915A (en) * 1973-04-17 1976-01-06 Westinghouse Electric Corporation Method of making an electrical article
US4729166A (en) * 1985-07-22 1988-03-08 Digital Equipment Corporation Method of fabricating electrical connector for surface mounting
US20060195969A1 (en) * 2005-03-02 2006-09-07 Ragan Thomas G Glove construction and method of making same
US7784113B2 (en) * 2005-03-02 2010-08-31 Shelby Group International, Inc. Glove construction and method of making same
US10201199B2 (en) 2012-08-30 2019-02-12 Shelby Group International, Inc. Glove finger attachment system
US10842207B2 (en) 2012-08-30 2020-11-24 Shelby Group International, Inc. Glove finger attachment system
US9549578B2 (en) 2012-08-30 2017-01-24 Shelby Group International, Inc. Glove finger attachment system
US9072325B2 (en) 2012-08-30 2015-07-07 Shelby Group International, Inc. Glove finger attachment system
US10021924B2 (en) 2012-08-30 2018-07-17 Shelby Group International, Inc. Glove finger attachment system
US10136688B2 (en) 2013-03-15 2018-11-27 Shelby Group International, Inc. Glove thermal protection system
US9510628B2 (en) 2013-03-15 2016-12-06 Shelby Group International, Inc. Glove thermal protection system
US11779069B2 (en) 2013-03-15 2023-10-10 Bunzl Ip Holdings, Llc Glove thermal protection system
US20170033631A1 (en) * 2015-07-29 2017-02-02 Siemens Energy, Inc. Method for roebel transposition of form wound conductors of electrical machines such as generators and motors
WO2017108254A1 (de) * 2015-12-22 2017-06-29 Siemens Aktiengesellschaft Elektrische maschine mit einem stator sowie deren verfahren zur herstellung eines derartigen stators
EP3185404A1 (de) * 2015-12-22 2017-06-28 Siemens Aktiengesellschaft Elektrische maschine mit einem stator sowie deren verfahren zur herstellung eines derartigen stators
CN108475953A (zh) * 2015-12-22 2018-08-31 西门子股份公司 具有定子的电机器及其用于制造这种定子的方法
RU2696251C1 (ru) * 2015-12-22 2019-08-01 Сименс Акциенгезелльшафт Электрическая машина со статором и способ изготовления такого статора
US10381898B2 (en) 2015-12-22 2019-08-13 Siemens Aktiengesellschaft Electric machine having a stator and method thereof for producing a stator of this type
US10694795B2 (en) 2017-01-10 2020-06-30 Shelby Group International, Inc. Glove construction
US11419370B2 (en) 2017-01-10 2022-08-23 Bunzl Ip Holdings, Llc Glove construction
US11950648B2 (en) 2017-01-10 2024-04-09 Shelby Group International, Inc. Glove construction

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GB942398A (en) 1963-11-20
JPS388415B1 (it) 1963-06-07

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